Hello all,
I was wonder if there is a way to turn a model instance into an
instance of a subclass of it's class. E.g.:
class Document(models.Model):
doctype = models.CharField(max_length=256, blank=True, null=True)
class UploadedFile(Document):
filename = models.CharField(max_length=256)
Given a Document that isn't already an UploadedFile, can I turn it
into one? I know at the database level it's just a matter of inserting
a new row into the uploadedfile table with document_ptr_id = the
Document's id. I've tried
doc = Document.objects.create(doctype='photo')
uf = UploadedFile(
document_ptr=doc,
filename='test.jpg',
)
uf.save()
But that seems to produce two separate instances (i.e. uf.doctype !=
doc.doctype).
Is there a way to do this?
Thanks in advance.
-Morgan Wahl
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